Cellulose-ether composition



Patented Sept, 4, I923.

UNITE.- s

STEWART JZCARROLL, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

CELLULOSE-ETHER COMPOSITION.

No Drawing.

1 This invention relates to new compositions of matter in which cellulose ethers' are mixed with other substances so that they can be advantageously used inthe plastic and analogous arts, such, for ex- 1 ample, as sheet or film or varnish manufacture.

One object of my invention is to provide compositions of increased utility in the plastic and analogous arts. Another object of my invention is to provide compositions which may be made into strong, flexible, transparent films, moulded articles, etc. Further objects will hereinafter appear.

I have discovered that a composition of matter having these desired characteristics can be obtained by mixing or compounding cellulose ether, say of the type indicated in U. S. Patent 1,188,376, Lilienfeld, June 20, 1916, with ethyl iodid and certain alkyl compounds. In the preferred forms of my invention I may add one or more of the following alkyl compounds: monohydroxy a iphatic alcohols of less than six carbon' atoms, the acetates of such alcohols, acetone. I prefer to use with ethyl iodid, one or more volatile vehicles to carry the ingredients and control evaporation, such as ethyl alcohol, methyl alcohol, ethyl 4 methyl acetate, acetone.

acetate,

Application filed March 3, 1922. Serial Ito/540,857.

By way of illustration, I may dissolve cellulose ether, like water-insoluble ethyl cellulose, in from 90 to 10 parts of ethyl iodid mixed with from 10 to 90 parts of said alkyl compounds, such as methyl acetate. For instance, an excellent viscous fihn-making dope is prepared by dissolving one part by weight of said ethyl cellulose in from 4 to 6 (say 5)v parts of a mixed solvent containing ethyl iodid and methyl acetate in equal proportions.

Other substances which impart useful qualities to the fihn may be added, if desired, such as triphenyl or tricresyl phosphate, camphor, monochlornaph-thalene, etc. 66 The ingredients are of the commercial type, sufficiently purified for the purpose in view. For film dopes, they are prepared to yield films of the proper relative freedom from color.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

' l.'A composition of matter comprising cellulose ether, ethyl iodid and methyl acetate.

2. A composition of matter comprising cellulose ether dissolved in a mixture containing from 90 to 10 part-s by weight of ethyl iodid and 10 to 90 parts of a volatile 70 vehicle carrying said ingredients.

3. A viscous fiowable composition com: prisingone part by weight of water-insoluble ethyl cellulose, and from 4 to 6 parts of a solvent containing ethyl iodid.

Signed at Rochester, New York, this 27 day of February 1922.

STEWART J. CARROLL. 

